Rockwell Automation SF3000 Parallel Gate Amplifier System - Manual (Page 19)

About the PGA Power Supply Module 3-1
C
HAPTER
3
About the PGA Power Supply
Module
Through its faceplate connectors, the PGA Power Supply module (B/M O-60055)
provides the interface with the DC Power Technology module in the PMI rack. The
Power Supply module provides the gate signals and the DC voltages necessary for
the proper operation of the PGA modules through the backplane of the PGA rack.
The following sections provide mechanical and electrical descriptions of the Power
Supply module. Component layout is shown in figure 3.1. A functional block diagram
is shown in figure 3.2.
3.1 PGA Power Supply Module Mechanical Description
The PGA Power Supply module plugs into the leftmost slot of the PGA rack. The
module consists of an internal regulated power supply, a printed circuit board
containing a DC-to-DC converter, and a faceplate. The faceplate has two
thumbscrews at the top and two at the bottom to secure the module in the rack. The
back of the module connects to the rack backplane. Power Supply module
specifications are given in Appendix B.
The faceplate of the module contains a green LED indicator, two fifteen-pin male
D-Shell connectors, an 8A fuse, and a ten-point power connector. The LED, labeled
"PWR OK," indicates that the module’s +28 VDC and +5 VDC output voltages are
present. If either supply fails, the LED will turn off. The two D-shell connectors, labeled
"Input A" and "Input B," are used to connect the forward and reverse gate signals from
the DC Power Technology module to backplane channels A and B.
The ten-point power connector provides the 115 VAC input to the Power Supply
module, 115 VAC output to the rack fan, connection to an optional external power
supply, and access to a pair of normally closed contacts ("TW1" and "TW2") for over-
temperature warning. Terminal "L1" is the connection for the AC hot input line.
Terminal "L2" is the connection for the AC neutral input line. These terminals are
internally hardwired to the L1 and L2 terminals labeled "115VAC OUTPUT TO FAN."
The Power Supply module’s ground terminal must be connected to earth ground, in
addition to the PGA rack’s grounding lug.
!
ATTENTION: This equipment must be connected to a power source for
which it was designed. Verify that the available power is 115 volts AC
(10 KVA maximum input source).
!
ATTENTION: Ungrounded equipment presents a shock hazard. The
ground terminal on the PGA power supply module and the grounding lug
on the PGA rack are not connected together. Connect both points to an
external earth ground.